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在私有(private)框架、应用程序和扩展中使用静态库中的类的正确方法应该是什么?我的示例项目可以在这里找到 https://github.com/keithyipkw/framework
在第二次提交中,SDK 与 .a 链接。运行应用程序产生了错误
Ld /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator/FrameworkApp.app/FrameworkApp normal x86_64
cd /Users/keithyip/Documents/Workspace/FrameworkApp
export IPHONEOS_DEPLOYMENT_TARGET=8.4
export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.4.sdk -L/Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator -F/Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator -filelist /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Intermediates/FrameworkApp.build/Debug-iphonesimulator/FrameworkApp.build/Objects-normal/x86_64/FrameworkApp.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=8.4 /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator/SDK.framework/SDK -Xlinker -dependency_info -Xlinker /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Intermediates/FrameworkApp.build/Debug-iphonesimulator/FrameworkApp.build/Objects-normal/x86_64/FrameworkApp_dependency_info.dat -o /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator/FrameworkApp.app/FrameworkApp
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_GAI", referenced from:
objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
该符号在 .a 中是全局的,但在 SDK 中是本地的
$ nm -a /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator/SDK.framework/SDK | grep '_OBJC_CLASS_$_GAI'
00000000000d94e0 s _OBJC_CLASS_$_GAI
在第三次提交中,我将 .a 添加到应用程序目标。应用程序运行但有警告
objc[3743]: Class GAI is implemented in both /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator/SDK.framework/SDK and /Users/keithyip/Library/Developer/CoreSimulator/Devices/752A7B8E-405E-4403-BDD8-A168613774B1/data/Containers/Bundle/Application/D16B5121-2DA9-452B-9574-95B35AE3E197/FrameworkApp.app/FrameworkApp. One of the two will be used. Which one is undefined.
我根据警告中的文件路径检查了SDK和应用程序二进制文件
$ nm -a /Users/keithyip/Library/Developer/Xcode/DerivedData/FrameworkApp-bpzqozighjdtncegosucvgelzagc/Build/Products/Debug-iphonesimulator/SDK.framework/SDK | grep '_OBJC_CLASS_$_GAI'
00000000000d94e0 s _OBJC_CLASS_$_GAI
$ nm -a /Users/keithyip/Library/Developer/CoreSimulator/Devices/752A7B8E-405E-4403-BDD8-A168613774B1/data/Containers/Bundle/Application/D16B5121-2DA9-452B-9574-95B35AE3E197/FrameworkApp.app/FrameworkApp | grep '_OBJC_CLASS_$_GAI'
0000000100032c88 s _OBJC_CLASS_$_GAI
通过 nm -m 深入挖掘,libGoogleAnalyticsServices.a 与其他静态库不同。链接到动态库中的其他库是没有问题的。
0000000000002b20 (__DATA,__objc_data) private external _OBJC_CLASS_$_GAI
让符号公开似乎是不可能的
clang: error: invalid argument '-keep_private_externs' not allowed with '-dynamiclib'
最佳答案
通常您可以简单地将静态库链接到动态库。但是在这种情况下.a 中的符号是外部私有(private)的(visibility=hidden),不可能将libGoogleAnalyticsServices.a 包含到动态库中并在iOS 上使用动态库之外的符号。此刻解决它的选项是
如果以后有人遇到类似的情况,其他的选择是
关于ios - 如何在 iOS 上的嵌入式私有(private)框架和 App 中使用静态库,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32485110/
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